circle filled with straight lines

A circle filled with straight lines. It has been used in some meteorogical contexts as a sign for rain. 
    Other rain signs from ancient times and on are ,  and .
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circle divided by a horizontal line

30:1 · The circle divided by a horizontal line is a structure often found on rock carvings. In early Chinese calligraphy it represented the sun(the earliest sun sign was , though). In the Greek alphabet the structure is used to signify the letter theta. The sign is used in at least ten different ideographic systems of natural science, and in the [...]

circle divided by a vertical line

30:3 · The circle divided by a vertical line is an ancient sign of the alphabets used in antiquity in the Near East. The alchemists used it to signify nitrogen, or saltpeter. Among the Hittites  and  were closely associated with the idea of lightning. 
    In his nineteenth-century system for the chemical elements John Dalton used  for nitrogen. 
    Some meteorological sign systems used  for solar halo.
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Fu Lu Shou

Fu Lu Shou (traditional Chinese: 福祿壽; simplified Chinese: 福禄寿; pinyin: Fú Lù Shòu) refers to the concept of Good Fortune (Fu), Prosperity (Lu), and Longevity (Shou). This Taoist concept is thought to date back to the Ming Dynasty, when the Fu Star, Lu Star and Shou Star were considered deities of these attributes respectively. The term is commonly used in Chinese culture to [...]

currency sign

 

The currency sign (¤) is a character used to denote a currency when the symbol for a particular currency is unavailable. It is particularly common in place of symbols such as that of the Colón (₡), which are absent from most character sets and fonts. It can be described as a circle the size of a lowercase character with [...]

Anarchy symbol

While anarchists have historically largely denied the importance of symbols to political movement, anarchists have embraced certain symbols for their cause, including most prominently the circle-A and the black flag. Since the revival of anarchism at the turn of the 21st-century concurrent with the rise of the anti-globalization movement, anarchist cultural symbols are widely present.
The Circle-A is almost certainly the best-known present-day symbol for [...]

Squatting symbol

Squatting is the act of occupying an abandoned or unoccupied space or building, usually residential, that the squatter does not own, rent or otherwise have permission to use. Squatting is significantly more common inurban areas than rural areas, especially when urban decay occurs. According to author Robert Neuwirth, there are one billion squatters globally, that is to say about one in every seven people [...]

Adinkrahene

 

“Chief of the adinkra symbols”
Adinkra are visual symbols, originally created by the Akan of Ghana and the Gyaman of Cote d’Ivoire in West Africa, that represent concepts or aphorisms. Adinkra are used on fabric, walls, in pottery, woodcarvings and logos. Fabric adinkra are often made by woodcut sign writing as well as screen printing. They also can be used to communicate evocative messages that represent parts of their life or those around them.
The adinkrahene is  a symbol of [...]

Nannan/sin

20:7 · This ideogram is very old. It was a symbol for the moon god Nannan, later Sin, in the Euphrates-Tigris region. The sign has most likely been in use from around 2500 B.C. During the Babylonian times it appeared with  and  for the Venus god and the Sun god, respectively. See these signs in Group 26 and Group 25. 
    The structurally almost identical  and  appear today in astronomy and almanacs signifying [...]

The shamash-seal

Shamash was the common Akkadian name of the sun god and god of justice in Babylonia and Assyria, corresponding to Sumerian Utu.
The name simply means “sun”. Both in early and in late inscriptions Sha-mash is designated as the “offspring of Nannar”; i.e. of the moon-god, and since, in an enumeration of the pantheon, Sin generally takes precedence of Shamash, it is in relationship, presumably, to the moon-god that [...]