Quotes:F
H. P. Blavatsky
F. The sixth letter of the English alphabet, for which there is no equivalent in Hebrew. It is the double F F of the Æolians which became the Digamma for some mysterious reasons. It corresponds to the Greek phi. As a Latin numeral it denotes 40, with a dash over the letter (F) 400,000.
Source: H. P. Blavatsky, The Theosophical Glossary, art. F