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also mention isconcretetype and isabstracttype
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‎doc/src/manual/calling-c-and-fortran-code.md

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First, let's review some relevant Julia type terminology:
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| Syntax / Keyword | Example | Description |
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|:----------------------------- |:------------------------------------------- |:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| `mutable struct` | `BitSet` | "Concrete Type" :: A group of related data that includes a type-tag, is managed by the Julia GC, and is defined by object-identity. The type parameters of a concrete type must be fully defined (no `TypeVars` are allowed) in order for the instance to be constructed. |
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| `abstract type` | `Any`, `AbstractArray{T, N}`, `Complex{T}` | "Super Type" :: A super-type (not a concrete type) that cannot be instantiated, but can be used to describe a group of types. |
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| `T{A}` | `Vector{Int}` | "Type Parameter" :: A specialization of a type (typically used for dispatch or storage optimization). |
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| | | "TypeVar" :: The `T` in the type parameter declaration is referred to as a TypeVar (short for type variable). |
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| `primitive type` | `Int`, `Float64` | "Primitive Type" :: A type with no fields, but a size. It is stored and defined by-value. |
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| `struct` | `Pair{Int, Int}` | "Struct" :: A type with all fields defined to be constant. It is defined by-value, and may be stored with a type-tag. |
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| | `ComplexF64` (`isbits`) | "Is-Bits" :: A `primitive type`, or a `struct` type where all fields are other `isbits` types. It is defined by-value, and is stored without a type-tag. |
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| `struct ...; end` | `nothing` | "Singleton" :: a concrete Type or Struct with no fields. |
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| `(...)` or `tuple(...)` | `(1, 2, 3)` | "Tuple" :: an immutable data-structure similar to an anonymous struct type, or a constant array. Represented as either an array or a struct. |
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| Syntax / Keyword | Example | Description |
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|:----------------------------- |:------------------------------------------- |:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `mutable struct` | `BitSet` | "Concrete Type" :: A group of related data that includes a type-tag, is managed by the Julia GC, and is defined by object-identity. The type parameters of a concrete type must be fully defined (no `TypeVars` are allowed) in order for the instance to be constructed. Also see [`isconcretetype`](@ref). |
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| `abstract type` | `Any`, `AbstractArray{T, N}`, `Complex{T}` | "Super Type" :: A super-type (not a concrete type) that cannot be instantiated, but can be used to describe a group of types. Also see [`isabstracttype`](@ref). |
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| `T{A}` | `Vector{Int}` | "Type Parameter" :: A specialization of a type (typically used for dispatch or storage optimization). |
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| | | "TypeVar" :: The `T` in the type parameter declaration is referred to as a TypeVar (short for type variable). |
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| `primitive type` | `Int`, `Float64` | "Primitive Type" :: A type with no fields, but a size. It is stored and defined by-value. |
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| `struct` | `Pair{Int, Int}` | "Struct" :: A type with all fields defined to be constant. It is defined by-value, and may be stored with a type-tag. |
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| | `ComplexF64` (`isbits`) | "Is-Bits" :: A `primitive type`, or a `struct` type where all fields are other `isbits` types. It is defined by-value, and is stored without a type-tag. |
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| `struct ...; end` | `nothing` | "Singleton" :: a concrete Type or Struct with no fields. |
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| `(...)` or `tuple(...)` | `(1, 2, 3)` | "Tuple" :: an immutable data-structure similar to an anonymous struct type, or a constant array. Represented as either an array or a struct. |
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### [Bits Types](@id man-bits-types)
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