No. of Recommendations: 3
Britannica has this to say:
The most widely recognized gender symbols are the circle above a cross (♀), signifying female, and the circle below an arrow pointing diagonally upward to the right (♂), signifying male. These symbols are used in various contexts, including on restroom signs, as shorthand for scientific or medical purposes, and in other instances where gender identification or representation is relevant. Increased awareness of transgender and nonbinary identities gave rise to additional gender symbols. The transgender symbol (⚧) is one such sign. It typically consists of the traditional male and female symbols joined on the circle with a third element that is a combination of an arrow and a cross, representing the blending or transcendence of conventional gender categories. The combined Venus and Mars symbol (⚥) is a bigender designation.So if ⚧ was engraved on the shell casings, that would clearly mean something.
But I've also seen the symbol using three parallel downward left pointing arrows in a circle as a trans symbol. See
etsy.com - Three arrows transgender flagBut it's also the symbol of the Social Democratic Party of Germany!
en.wikipedia.org - Three ArrowsAnd is also apparently a general antifascist symbol:
no-gods-no-masters.com - The three arrows antifa symbol 