s1=c1 is a linguistic-gesture unit/chereme [in analogy with phoneme; specifically, nonvocal] representing/that is recognized meaningful conceptual subunit underlying specific gestures/gesture-phones s2 in language b1 used by b2 in order to communicate/express b3=c2 (si'o/du'u; not quote) made using body part/utensil/tool/locus c3 by motion/action/means c4
x1 is a "false friend" (letter/symbol in a different writing system that looks similar, but differs significantly in meaning) to x2, in alphabet/character-set x3 representing x4
x1 is a "false friend" (word in different language that looks or sounds similar, but differs significantly in meaning) to x2, meaning x3 in language x4.
x1 is a "false friend" (word in different language that looks or sounds similar, but differs significantly in meaning) to x2, meaning x3 in language x4.
x1 uses language / language feature / complete language / language dialect or variation / dictionary / semantics / other language standard or specification or open source fork x2 for text / purpose / to express / communicate x3; x1 is using / declaring language / language extension x2.