'Token' is PIE *deyk- (to show, point) — an etymological sibling of 'teach' and Latin 'dicere.'
A sign, symbol, or object serving as evidence or proof of something; a piece resembling a coin used as a substitute for money.
From Old English 'tācen' (sign, mark, symbol, evidence, proof, wonder), from Proto-Germanic *taikną (sign, signal, indication), from PIE *deyḱ- (to show, to point out). The PIE root *deyḱ- is one of the great pointing-and-showing roots: Latin 'dicere' (to say — to point things out with words) → 'indicate', 'diction', 'dictate'; Greek 'deiknunai' (to show) → 'paradigm', 'apodictic'; Sanskrit 'diśati' (points, shows). A token is therefore literally 'a showing' or 'a thing that shows' — an object or sign that points beyond itself to something else, proving
Old English 'tācen' and the verb 'tǣcan' (to teach) are closely related — both from Proto-Germanic *taikną. Teaching was originally conceived as 'showing' or 'pointing out,' making 'token' and 'teach' etymological siblings from the PIE root *deyḱ- (to point out), the same root behind Latin 'dīcere' (to say) and 'index' (pointer).