Quick search brought the following link which asks the same question and provided answers including other links for examples:

http://oshiete1.goo.ne.jp/qa531957.html

ギポシ is a typo for ギボシ. See the pictures in this link. We usually see them on a bridge, Buddhist temple and "jinja" in Japan. Don't you see them in Singapore?

http://ja.wikipedia.org/wiki/擬宝珠

ぎぼし端子 is a lug with a shape of this at an end of a wire. See, for instance, the second one from the right in the picture in the link.

http://www.bosch.co.jp/jp/aa/products/group.asp?id=CEConnect...

This one, and most lugs of this type, has a wire crimped, in which case they are called as 圧着端子. But ギポシ refers to the shape of the end that can be screwed. It does not refer to how a wire is attached; crimped or soldered (although crimping is used most of the time).

You can see typical uses of them here:
http://en.wikipedia.org/wiki/Screw_terminal

http://www.kamidana.co.jp/shop/index.php?search=1&sub_catego...

ぎぼし [擬宝珠］
（１） 欄干の柱頭のネギの花に似た形の飾り． （２） 「ネギの花」の別称． （３） ** 植物の一．ユリ科の多年草． ◇ ＊「ぎぼうし・ぎぼうしゅ」とも．
http://www.weblio.jp/content/擬宝珠




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Note added at 9 hrs (2008-02-26 12:22:34 GMT)
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FYI
bullet terminal
http://www.proz.com/kudoz/2438029
bullet terminal, faston, shur plug
http://trans.kato.gr.jp/bbs2/searchbbs.cgi

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Note added at 9 hrs (2008-02-26 12:28:30 GMT)
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http://ron.proz.com/kudoz/248180

Wire terminal grips

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Note added at 11 hrs (2008-02-26 14:33:19 GMT)
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ギポシ-GBS(Gardner Bender Solderless)Terminal lugs?