A Mnemonic is a device which is intended to help a person’s memory. Some mnemonics are given below:

(1)The first 8 digits of π are given by the number of letters in each of the words in the question below. Nine digits are given in the second sentence.

May I have a large container of coffee ?
3. 1 4 1 5 9 2 6

See, I have a rhyme assisting my feeble brain
3. 1 4 1 5 9 2 6 5

(2)The reciprocal of π to 6 decimal places is given by the number of letters in each of the words in this question:

Can I remember the reciprocal?
.3 1 8 3 10

(3)The first 4 digits of square root of 2 are given by the number of letters in each of words in the answer to the question:

The root of two ? I wish I knew
1. 4 1 4