It is a nor gate.That is extensively used in digital circuits. it is a complement of OR gate.

vhdl eg\0~alu.vhd
.......\0~index.html
.......\active0.jpg
.......\active1.jpg
.......\active2.jpg
.......\active3.jpg
.......\active4.jpg
.......\active5.jpg
.......\active6.jpg
.......\active8.jpg
.......\active9.jpg
.......\Active_Tutorial.html
.......\adder.jpg
.......\adder.vhd
.......\adder_sch.jpg
.......\adder_sim.jpg
.......\ALU.jpg
.......\ALU.vhd
.......\alu_sch.jpg
.......\alu_sim.jpg
.......\and.jpg
.......\AND_gate.vhd
.......\area.jpg
.......\Area_Timing.jpg
.......\area_timing_table.jpg
.......\backontop.gif
.......\bg.jpg
.......\bigmux.vhd
.......\book1.gif
.......\bridge.jpg
.......\bridge.vhd
.......\bridge2.jpg
.......\bridge2.vhd
.......\bridge2_gate.vhd
.......\bridge2_sch.jpg
.......\bridge_gate.vhd
.......\bridge_sch.jpg
.......\bridge_sim.jpg
.......\coffeecup.gif
.......\combckt_sch.jpg
.......\comb_ckt.jpg
.......\comb_ckt.vhd
.......\comb_sim.jpg
.......\comparator.jpg
.......\comparator.vhd
.......\comparator_sch.jpg
.......\comparator_sim.jpg
.......\controller.vhd
.......\counter.jpg
.......\counter.vhd
.......\counter_gate.vhd
.......\counter_sch.jpg
.......\counter_sim.jpg
.......\counter_syn.scr
.......\cpublock.jpg
.......\cpugatesim.scr
.......\cpuhierarchy.jpg
.......\cpusim.scr
.......\cpusim1.jpg
.......\cpusim2.jpg
.......\cpusyn.scr
.......\ctrl_unit.vhd
.......\datapath.vhd
.......\decoder.jpg
.......\decoder.vhd
.......\decoder_sch.jpg
.......\decoder_sim.jpg
.......\dff.jpg
.......\dff.vhd
.......\dff_gate.vhd
.......\dff_sim.jpg
.......\driver.jpg
.......\DRIVER.vhd
.......\FIR.vhd
.......\fir1.jpg
.......\fir2.jpg
.......\fir_gate.vhd
.......\fir_sch.jpg
.......\fir_sim.jpg
.......\FIR_syn.scr
.......\Flashball.gif
.......\fsm.vhd
.......\fsm_gate.vhd
.......\fsm_sch.jpg
.......\fsm_sim.jpg
.......\gcd.jpg
.......\GCD.vhd
.......\gcd1.vhd
.......\gcd2.jpg
.......\gcd2.vhd
.......\gcd2_gate.vhd
.......\gcd2_sch.jpg
.......\gcd2_sim.jpg
.......\gcd_gate.vhd
.......\gcd_sch.jpg
.......\gcd_sim.jpg
.......\index (2).html
.......\index.html
.......\inverter.jpg
.......\IR.vhd

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