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In the [Japanese radiotelephony
alphabet](https://en.wikipedia.org/wiki/Japanese_radiotelephony_alphabet#Kana),
all kana are assigned a mnemonic code word in the form _Nippon no ni_
(日本のニ)... except one.

ヱ ( _we_ ) alone stands out with _kagi no aru we_ (かぎのあるヱ). Why is this used
instead of eg. ゑびすのヱ, and what does " _we_ that has the key" mean?

Note that ゐどのヰ is used for ヰ, another obsolete kana with a homophone, so I
presume there's more to it that just avoiding potential confusion between エ
and ヱ.
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meaning kana
What does かぎのあるヱ mean?
I think it means "the e with the hook". If you compare エ with ヱ, ヱ has a hook
in the first horizontal.
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Am I right to rephrase your question as: why かぎのあるヱ transcribes the character
by the shape, while ゐどのヰ, along with all the other ones, transcribes the
character by the sound?

Today, standard Japanese doesn't distinguish ゐ/い ゑ/え を/お by their sounds. This
means that virtually any contemporary Japanese would write "い" when requested
to write "ゐどのヰ" in their daily conversations.

Historically, Japan joined Convention on International Civil Aviation, which
required standardization of radiotelephony alphabet, in 1953.

This suggests that ゐ was pronounced still differently than い in daily (or even
official) conversations around 1950's, while ゑ was already pronounced the same
way as え.

("現代かなづかい", which ordered "ゑ" be written as "え" etc. in public, was enacted in
1946.)

I didn't notice that my four grandparents, all born around 1930s in Kyushu,
distinguished ゐど from いど or ゑびす from えびす. But I cannot tell for sure, because
their pronunciation was always shifted somewhat from our Tokyo dialect.

However I found this from twitter: ‏@hirohito_bot
【昭和天皇逸話集】日常会話においても「い」と「ゐ」、「え」と「ゑ」の発音を区別していた。

Emperor Hirohito was born in 1901 in Tokyo, and perhaps would represent the
pronunciation of then Japanese upper class speech at the time. However, his
son, Emperor Akihito, never distinguishes them in public speech. He was born
in 1933.

So I think you are right in saying that "there's more to it", because all this
indicates that Showa was a subtle but major phonological transition period.
But this may require a serious linguist to analyse, and I refrain from talking
about it other than from my personal experience.

(In kindergarten I used to believe the "correct" pronunciation of を was "wo",
and was not the same as お, because they are spelled differently. Some comic
books even used them in proper names, as in アキヲ. But since my friends and
teachers never spoken that way I gave up the idea.)
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