This part is a kind of semiconductor called 74LS00.
Function of this product has Quad 2-Input NAND Gate.
Manufacturers : Fairchild Semiconductor
Image and pinout :

Some of the text within the PDF file :
DM74LS00 Quad 2-Input NAND Gate August 1986 Revised March 2000 DM74LS00 Quad 2-Input NAND Gate General Description This device contains four independent gates each of which performs the logic NAND function. Ordering Code: Order Number DM74LS00M DM74LS00SJ DM74LS00N Package Number M14A M14D N14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Y = AB Inputs A L L H H H = HIGH Logic Level L = LOW Logic Level Output B L H L H Y H H H L © 2000 Fairchild Semiconductor [ ... ]
74LS00 PDF Datasheet Download
