geta mark

== English == === Etymology === Partial calque from Japanese 下(げ)駄(た)記(き)号(ごう) (geta kigō), alluding to the similarity between the shape of this symbol and that of a footprint from a geta shoe. === Noun === geta mark (plural geta marks) (typography) The symbol 〓, used as a placeholder in electronic or printed text to indicate the presence of an ideographic character for which no glyph is available.