Japanese

井桁: the wooden frame around the wellhead is the igeta.
井桁: the igeta shape of crossed beams in the ceiling of the US Library of Congress.	井桁: the Igeta family crest.

Noun

井桁 ‎(hiragana いげた, romaji igeta, historical hiragana ゐげた)

1. a puteal: a wellhead for a water well, traditionally consisting of a wooden enclosure framed along the top, and possibly bottom, with stout wooden beams crossed at the ends
2. the symbols #, ＃, or ♯
3. a pattern similar to the symbol #, such as the shape of the crossed beams on a beam or coffered ceiling
4. a kind of 家紋 ‎(kamon, “family seal”) featuring such a symbol
5. the number four in the argot of fishmongers

   Possibly from the way that the character 井 has four strokes, and the way that 桁 ‎(keta) also means digit.

6. an advanced remodelling technique for the chassis of a miniature four-wheel-drive racing model, consisting of a reinforcement similar in shape to a traditional Japanese wellhead

Proper noun

井桁 ‎(hiragana いげた, romaji Igeta, historical hiragana ゐげた)

1. a surname

References

1. ↑ 2006, 大辞林 (Daijirin), Third Edition (in Japanese), Tōkyō: Sanseidō, ISBN 4-385-13905-9
2. ↑ 1998, NHK日本語発音アクセント辞典 (NHK Japanese Pronunciation Accent Dictionary) (in Japanese), Tōkyō: NHK, ISBN 978-4-14-011112-3