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Some letters are silent in some dialects and pronounced in others. Examples: Often was pronounced with silent "t" when I was young in Australia, now, under the influence of outside speakers, many people pronounce the "t". Similarly, in the word white, which is a respelling of the Old English HWIT (with long "I"), the "h" is sounded and many English speakers still pronounce the "h" before the "w", especially educated speakers and Received Pronunciation speakers in UK. Some consonants are becoming silent in Australian English, even amongst "educated" speakers like radio announcers, with twenty pronounced "twenny" and gift, "gif". One hopes that this is more laziness and not a permanent change.
To the above answer can be added that some letters were added to English words for various reasons, an example being "island" which comes from Old English, igland; during the 16th Century the "s" was added due to a (incorrect) perception of a relationship with the the French word isle which had a silent "s" (later dropped altogether, to Île). Also, some words like "knight" from Old English cniht originally had the "k" sound pronounced. The "h" in cniht was originally pronounced like the "ch" in Scottish loch, when Norman French scribes wrote the OE word down after 1066 they substituted "gh" for "h" and over time, pronunciation changed such that the "gh" became silent although English speakers know that it gives the "i" the long sound that would otherwise be denoted by having an "e" added to the end of the word (bit/bite etc).
English spelling has more than one purpose. It has to enable you to identify a word, and to indicate in some manner how the word is pronounced, but it is also spelled in a certain way because of its derivation (or etymology as it is called) in order to give you some sense of why that word means what it does. English spelling is full of implied history lessons. Some words come from old Anglo-Saxon, others are derived from French, some from Latin. And so forth.
There is no such thing as a silent alphabet. Alphabets are used to represent the sounds of a language. A silent alphabet would have no function, unless you are talking about sign language alphabets. In that case, all sign language alphabets are silent.
There are many alphabets used in Canada, but officially there are only 2: the English and French Alphabets.
ALL English Alphabets are used in America Especially USA but for some words American's avoid U. For eg. Color = Colour, Honor=Honour
There are no commonly used words in English where the letter "o" is silent. However, there may be some words borrowed from other languages, like "doux" in French, where the "x" is pronounced instead of "ou".
Ö, Ä, Å, Ü,...
It depends on what language the drawing is in. For English, the Latin alphabet is used.
It depends on which alphabets you are talking about. In the latin alphabet for English, the most common letter is E, and the least common is Z.
It was modified into Greek and Roman alphabets, and so is a basic fore-runner of the English alphabet.
The three Japanese alphabets are Hiragana, Katakana, and Kanji. Hiragana is used for native Japanese words and grammatical particles, Katakana is used for borrowed words and onomatopoeia, and Kanji consists of Chinese characters used for nouns, verbs, and adjectives in the Japanese language.
Yugoslavia used two alphabets: the Cyrillic and the Latin.
If you are talking about the letters of the words "PAN no", there is only one alphabet used: the Latin alphabet.
Hiragana is a fundamental component of the Japanese writing system and is used for native Japanese words, verb endings, particles, and sometimes for writing words that do not have a kanji equivalent. It is considered one of the basic scripts alongside katakana and kanji.