This week I have been making samples of different braids in thick cord to understand how they work.
4 Strand braids - from left - Bedfordshire lace 2 pair plait; mirror image (left over 1, right under 1 over 1); 2 colour braid (right over 1, left over 2).
Simple 2 loop braid (loops pass through each other); macrame semi knot; macrame whole knot.
From left - 3 variations of 7 strand twill; 8 strand plait using 3 outer strands on each side as a single strand; 8 strand square braid - over 5 back under 2.
Useful references - The Manual of Braiding - Naomi Speiser, The Renaissance Tailor, Phalia's String Page.