Orthographic similarity is computed using a string similarity metric LCSSim based on the longest common subsequence (LCS) of the two input words, returning a similarity score between 0 and 1: When w 1 and w 2 belong to different writing systems, LCS returns 0 and thus the formula above is not directly usable.
the use of Wiktra with respect to existing tools is justified by a need for high-quality results that also cover complex cases of orthography, e.g., in Semitic scripts where vowels are typically omitted.