Binary number
Adding together all the place values that have 1s, it would be 1+2+16+32+128 = 179.  For convenience, binary digits (bits, for short) are usually grouped together in two groups of 4 bits.  This is 8 bits, or a byte, and is written using the hexadecimal numeral system.  This would be shown as 1011 0011 = B3.