Yes, they are written with the Latin alphabet, but they are used in the
Japanese language, so I am not sure. I mean, they have entries in Japanese
dictionaries and a Japanese reading. What are they?

If they do count as Japanese words, does it mean the Latin alphabet is part of
the Japanese language?
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question
linguistics
Are words like CD or DNA counted as Japanese?
There are well-established initialisms and acronyms of Japanese origin. For
example:

  * TPO = time, place, occasion
  * NHK = 日本放送協会
  * JR = Japan Railways
  * JIS [ジス] = Japan Industrial Standard
  * JAL [ジャル] = Japan Airlines
  * JK = 女子高生
  * BL = boys love

If these aren't Japanese, what are they? I guess the Latin alphabets, or more
precisely, the 26 modern English alphabets, are already part of the Japanese
language nowadays.

As for _CD_ and _DNA_ , they are 外来語 (loanwords) and, as such, are Japanese
words, just as _samurai_ , _kanji_ , _manga_ , and _tsunami_ are English
words.

* * *

Other terms common in Japan that use alphabets:

  * S = 昭和, H = 平成, R = 令和
  * R18 = Restricted 18 (18+ ONLY)
  * X線 = X-ray
  * A級戦犯, B級グルメ
  * W = double
  * O脚, S字カーブ, V字回復, Y字バランス
  * GW = Golden Week
  * 3K = きつい、きたない、危険
  * G = ゴキブリ
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answer