Meanings of some symbols in electronics
It is a left shift operation. The first is a shift by 1 bit, the second is a shift by 2.

For example, let's consider an 8 bit word like the following (space added between each 4 bits for readability):

x: 1101 0011
&lt;&lt;------------ direction of the shift


if you shift it to the left by one bit, i.e. by one position, you get:

y: 1010 0110
&lt;&lt;------------ direction of the shift


Note that the leftmost bit has been "pushed out" of the word, whereas the rightmost bit has been replaced by a 0 (i.e. a 0 has been "pushed in from the right").

Shifting by two bits is equivalent to two consecutive 1 bit shifts, therefore if you shift y by one bit you get:

z: 0100 1100


Hence z is the result of left-shifting y by 1 bit or, equivalently, left-shifting x by 2 bits.