We commonly see a kind of font named Old English alphabet. We also download Old English alphabet A to Z as an additional font. However, there is a story behind this kind of letter. Anglo-Saxon used two different writing systems: Runes and Roman alphabet. However, the Runes one was used in limited occasions. Basically, the Roman alphabet in the Old English alphabet has the same system, even the letters. However, there are several letters that are commonly used in Old English only. We can't find them now. Those letters that are no longer used are named letters "thorn", "eth", "ash", and "wynn". Even the Roman alphabet and nowadays' alphabet are typically the same, however there are two additional letters that are used now, which are "J" and "V". Until the late Old English and Middle English era, letters K, Q, and Z are rarely used.
In this period of time, the letters that were used called Old English Latin alphabet. Or, the another term is Læden stæfrof. The alphabet system contains 24 letters. These letters were commonly used in the 8th to 12th centuries. Like the name, Latin alphabet, most of the letters were brought from the Latin alphabet. There are 20 letters that are from Latin alphabet. Two letters were the modified version of Latin letter. The last two letters were improved from the runic alphabet.
The Old English alphabet was documented in 1011. It was written by Byrhtferð. He was a monk at that time. The letters include ampersand too. There are some letters that we can't find nowadays. They are ong S (ſ), Eth (Ð and ð), Thorn (þ), Wynn (ƿ) and Ash (ᚫ; later Æ and æ).
Old English is commonly spoken by most of Anglo Saxon territories of the kingdoms. Old English comes from the West Germanic kind of language. This was developed from North Germanic dialect. Now, the kingdom becomes the Kingdom of England. The current areas of the Kingdom of England, including southeastern Scotland originally used Old English. Other parts of the island, Wales and most of Scotland kept using Celtic languages. However, in the area of Scandinavian settlements. The people inside the Scandinavian settlements used Old Norse. Celtic speech kept being used in several parts of English.