12

I have never seen this kind of symbol before and google has failed me.

This notation occurs in Chopin Nocturne Op. 9, No. 1, measure 2 beats 4–6.

Chopin Nocturne Op. 9, No. 1, measure 2 beats 4–6

21

It's an 11-tuplet. Like a triplet, but with 11 notes where there would otherwise be 8 (or some other power of 2).

1
  • 4
    It's also incorrectly notated: the 11-tuplet sign should be on the beam side
    – PiedPiper
    Jun 7 at 13:47
1

According to Wiktionary, the word to denote this is undecuplet or hendecuplet, although there are no articles for those words as of 8 June 2021.

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