Pillar 2
From Decrypting the NKRYPT sculpture
Pillar 2 contains two groups of designs plus a series of numbers on the base. It does not use traditional alphanumeric representations for the main codes.
Geometric Code
The top code is a grid of geometric shapes. These are shown in a grid of 5 rows by 26 columns. There are 26 discrete symbols. A small number of symbols have what appear to be manufacturing defects - small circles attached to other circles - for more info, see the combined photograph.
I have given each symbol a letter so that they can be represented here:
BEGHIJAKGKHLMCABCZBDEEFACZ ZDAZAQFNRQDSJANOAPQAJOBGFL HLTGMAKISKAZPAZZFACZATSAUC JZACOBDZDCAGOBFZEODJDSOFNP YVGFEACPAZLCHLMCAVCTTAKZWX |