As many tunes uses this type of chord, it would be nice to have it in IRP.
It's basically a diminished chord with a major 7th instead of diminished 7th (1, b3, b5, 7), so for a C dimished, that would be C, Eb, Gb, B.
It can also be noted as a B7b9/C but without the 7th (A).
Some popular standard using this type of chord: Corcovado, How insensitive (Jobim), My favorite things (Coltrane version), to name a few.