2021, Leo S. Hsu, Regina Obe, PostGIS in Action, 3rd edition, Simon and Schuster, →ISBN, page 183:
Tiny WKB (TWKB) Tiny WKB is another format used for web mapping that was introduced in PostGIS 2.2. Similar to the MVT format, it is a compressed binary format, but it's based on WKB format.