$ iex Erlang/OTP 21 [erts-10.0] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe] Interactive Elixir (1.6.6) - press Ctrl+C to exit (type h() ENTER for help) iex(1)> bs = << 3 :: size(2) >> <<3::size(2)>> iex(2)> is_bitstring(bs) true iex(3)> is_binary(bs) false iex(4)> byte_size(bs) 1 iex(5)> bs = << 0 :: size(2), 1 :: size(2), 2 :: size(2), 3 :: size(2)>> "\e" iex(6)> is_bitstring
