From未知(みち)(michi) +数(すう)(-sū).

• (Tokyo)みちすう[mìchíꜜsùù] (Nakadaka – [2])^[1]
• (Tokyo)みちすう[mìchísúꜜù] (Nakadaka – [3])^[1]
• IPA^(key): [mʲit͡ɕisɨː]

未(み)知(ち)数(すう)• (michi-sū) ^{←みちすう(mitisuu)?}

1. unknownquantity

   Antonym:既知数(kichi-sū)

2. (figuratively)unknown

• “未知数”, in漢字ぺディア [Kanjipedia]‎^[1] (in Japanese),The Japan Kanji Aptitude Testing Foundation,2015–2025

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