EDIT Why is A the first letter of the alphabet?
There is a United Kingdom television series called Time Team which is about Archaeology.

Time Team webspace

In a programme about a henge at Durrington Walls an A frame was used to erect a very large vertical wooden post in an exercise. It was said that there was no evidence that an A frame had been used to erect the original posts in about 2500 BC, yet that the technique of an A frame was known in various places around the world at that time.

That got me thinking. It is called an A frame today because it looks like a letter A in the Latin alphabet. Could it be that the letter A is at the start of the Greek and Latin alphabets because a structure of that shape was used to erect posts at the start of a construction task and so a structure of that shape was used to start the structure of the alphabet?


 
ADD NEWSIMILAR CHARACTERS
01 CODE POINT VALUE: : : : : 0391
02 NAME (UNICODE NAME) : : : GREEK CAPITAL LETTER ALPHA
03 GENERAL CATEGORY: : : : : Letter, Uppercase
04 COMBINING CLASS : : : : : Spacing, split, enclosing, reordrant, and Tibetan subjoined
05 BIDIRECTIONAL CATEGORY: : Left-to-Right
06 DECOMPOSITION MAPPING : : -
07 DECIMAL DIGIT VALUE : : : -
08 DIGIT VALUE : : : : : : : -
09 NUMERIC VALUE : : : : : : -
10 MIRRORED: : : : : : : : : No
11 UNICODE 1.0 NAME: : : : : GREEK CAPITAL LETTER ALPHA
12 ISO 10646 COMMENT FIELD : -
 
13  UPPERCASE MAPPING : : : : -
14 LOWERCASE MAPPING : : : : U+03B1
15 TITLECASE MAPPING : : : : -
16 DECIMAL VALUE : : : : : : 913
17 UTF-8 HEX VALUE : : : : : 0xCE91
18 UTF-16 HEX VALUE: : : : : 0x0391
19 UTF-32 HEX VALUE: : : : : 0x00000391
20 XHTML : : : : : : : : : : &#913
21 BLOCK : : : : : : : : : : Greek and Coptic
22 PLANE : : : : : : : : : : Basic Multilingual Plane (BMP)
23 STROKE NUMBER : : : : : : -
24 RADICAL : : : : : : : : : -
 < CHARACTER >  BLOCK PROPERTIES
U+0391 GREEK CAPITAL LETTER ALPHA
DEUTSCH : ENGLISH