English Wikipedia has an article on:

stop squark

Wikipedia

From s- +‎ top +‎ squark, from top quark.

stop squark (plural stop squarks)

1. (particle physics) A squark which is the hypothetical supersymmetric partner of a top quark.
   Symbol: ${\displaystyle {\tilde {t}}}$

Note the s- prefix on both words.

• squarks: sup squark · sdown squark · scharm squark · sstrange squark · stop squark · sbottom squark ^[edit]