U+05F1 Hebrew Ligature Yiddish Vav Yod

The Wikipedia has the following information about this codepoint:

Yiddish orthography is the writing system used for the Yiddish language. It includes Yiddish spelling rules and the Hebrew script, which is used as the basis of a full vocalic alphabet. Letters that are silent or represent glottal stops in the Hebrew language are used as vowels in Yiddish. Other letters that can serve as both vowels and consonants are either read as appropriate to the context in which they appear, or are differentiated by diacritical marks derived from Hebrew nikkud, commonly referred to as "nekudot" or "pintalach" (literally "points" as those marks are mostly point-like signs). Additional phonetic distinctions between letters that share the same base character are also indicated by either pointing or adjacent placement of otherwise silent base characters. Several Yiddish points are not commonly used in any latter-day Hebrew context; others are used in a manner that is specific to Yiddish orthography. There is significant variation in the way this is applied in literary practice. There are also several differing approaches to the disambiguation of characters that can be used as either vowels or consonants.

Words of Aramaic and Hebrew origin are normally written in the traditional orthography of the source language—i.e., the orthography of these words, which is consonant-based, is generally preserved (Niborski 2012). All other Yiddish words are represented with phonemic orthography. Both forms can appear in a single word—for example, where a Yiddish affix is applied to a Hebrew stem. Yiddish diacritics may also be applied to words that are otherwise written entirely with traditional orthography.