pilkku

pilkka (“mark”) +‎ -u; first adopted to mean "comma" by Finnish physician and translator Erik Alexander Ingman in 1844.

• IPA^(key): /ˈpilkːu/,
• Rhymes: -ilkːu
• Hyphenation^(key): pilk‧ku

Finnish Wikipedia has an article on:

pilkku

Wikipedia ^fi

pilkku

1. comma (punctuation mark ,)
2. (mathematics) dot (symbol , used for separating the fractional part of a decimal number from the whole part)
3. spot, dot (small spot or mark)
4. (slang) hashish (cannabis extract)
5. (colloquial) last call
6. (colloquial, soccer) penalty mark; thence: penalty kick, penalty shot
7. (mathematics) prime (symbol ′, as in x′)

In English-speaking countries dot ( . ) is used to separate decimals from the whole part and comma (, ) to separate powers of three, whereas in Finland along with most of continental Europe, the comma is used as the decimal marker. Due to English influence, in speech the "decimal comma" is sometimes read as piste (“dot”).

• (math symbol): desimaalipilkku
• (small spot): laikku, täplä, piste
• (hashish): hasis
• (last call): valomerkki

• pilkka

• “pilkku”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎ (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-03

Cognates include Finnish pilkku and dialectal Estonian pilg.

• (Ala-Laukaa) IPA^(key): /ˈpilkːu/,
• (Soikkola) IPA^(key): /ˈpilkːu/,
• Rhymes: -ilkːu
• Hyphenation: pilk‧ku

pilkku

1. piece of material
2. spot, mark (on an animal)

• Ruben E. Nirvi (1971) Inkeroismurteiden Sanakirja, Helsinki: Suomalais-Ugrilainen Seura, page 408