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jmdict 2853457 Active (id: 2177303)

まるファイ
1. [unc]
《also pronounced パイ》
▶ diameter symbol



History:
3. A 2022-02-02 21:11:46  Jim Breen <...address hidden...>
  Comments:
Thanks
2. A* 2022-02-02 18:29:52  Robin Scott <...address hidden...>
  Refs:
https://ja.wikipedia.org/wiki/径#直径記号
"JIS Z 8317では「まる」とされ、その後の改定で「ふぁい」という読み方も記載された"
https://kikakurui.com/z8/Z8317-1-2008-01.html
"φ:直径(呼び方:まる又はふぁい)"
  Comments:
ø looks almost identical to ⌀. I don't think that note is helpful.
Not a pref. Just a symbol.
According to JIS, it can be read ファイ. But interestingly, they use the italicised φ (phi), not the diameter symbol.
  Diff:
@@ -9,0 +10,3 @@
+<r_ele>
+<reb>ファイ</reb>
+</r_ele>
@@ -11,3 +14,3 @@
-<pos>&pref;</pos>
-<s_inf>occ. written ø, also pronounced パイ</s_inf>
-<gloss>diameter (units assumed, esp. mm)</gloss>
+<pos>&unc;</pos>
+<s_inf>also pronounced パイ</s_inf>
+<gloss>diameter symbol</gloss>
1. A* 2022-02-01 23:43:34  Jim Breen <...address hidden...>
  Comments:
Split from 2173820.

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