köken: From Old Swedish rættesnøre, equivalent to rätta (“align, straighten”) + -e- + snöre. Compare Danish rettesnor, Middle Low German richtsnōr, German Richtschnur. Now only used metaphorically, originally in the literal sense of strings used for alignment in bricklaying.
köken: From the verb סמל (“to symbolize”). Compare Phoenician 𐤎𐤌𐤋 (sml, “symbol”). The sense of "symbol" was strengthened due to phono-semantic matching of English symbol.
aile: סמל ראשון, רב סמל, רב סמל ראשון, רב סמל מתקדם, רב סמל בכיר
From the 連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb しるす (shirusu), which is cognate with the verb 知る (shiru) and the obsolete adjective しるし (shirushi) below. From Old Japanese. Ultimately from Proto-Japonic *sirosi.