Engineering notation

Scientific notation examples:

100:	1E2
1000:	1E3
10,000:	1E4
100,000:	1E5
1,000,000:	1E6
10,000,000:	1E7

Engineering notation examples:

100:	100
1000:	1E3
10,000:	10E3
100,000:	100E3
1,000,000:	1E6
10,000,000:	10E6

This custom cell format provides engineering notation with a variable number of decimal places:
##0.#E+0

This custom cell format provides engineering notation with 2 decimal places:
##0.00E+0