The 4023BDM is a NAND gate in a CDIP14 ceramic dual-in-line package. This is a through-hole logic device from the 4000-series CMOS family, intended for general-purpose logic gating in designs that require the mechanical and thermal robustness of a ceramic package. The CDIP14 body is a standard footprint for socketed or soldered mounting on boards where hermetic sealing or extended temperature range is needed — common in industrial control, avionics, and military/aerospace subsystems where plastic packages are not acceptable.
For a legacy ceramic-package logic gate, this is notable — many CDIP parts have moved to NRND or EOL. The active status reduces the risk of a sudden last-time-buy notice for ongoing production runs.