The ring finger is the fourth digit of the human hand, and the second most ulnar finger, located between the middle finger and the little finger. It is also called digitus medicinalis, the fourth finger, digitus annularis, digitus quartus, or digitus IV in anatomy.
In Western cultures a wedding ring is traditionally worn on the ring finger. This developed from the Roman "annulus pronubis" when the man gave a ring to the woman at the betrothal ceremony. According to tradition in some countries (derived from Roman belief), the wedding ring is worn on the left ring finger because the vein in the left ring finger, referred to as the vena amoris was believed to be directly connected to the heart, a symbol of love.
Blessing the wedding ring and putting it on the bride's finger dates from the 11th century. In medieval Europe, the Christian wedding ceremony placed the ring in sequence on the index, middle, and ring fingers of the left hand, representing the trinity — God the Father, God the Son, and God the Holy Spirit respectively. The ring was then left on the ring finger. In a few European countries, the ring is worn on the left hand prior to marriage, then transferred to the right during the ceremony. For example, a Greek Orthodox bride wears the ring on the left hand prior to the ceremony, then moves it to the right hand after the wedding. In England, the 1549 Prayer Book declared "the ring shall be placed on the left hand". By the 17th and 18th centuries the ring could be found on any finger after the ceremony - even on the thumb.
In the Jewish wedding ceremony, the groom places the ring on the bride's index finger, and not ring finger; the ring is usually moved to the ring finger after the ceremony.
In the Indian tradition, the left hand is considered inauspicious. Hence the wedding ring is worn on the right hand. However, despite tradition, some wear the ring on the left hand, matching cultural practice in some western countries.
Modulation of Ubc4p/Ubc5p-Mediated Stress Responses by the RING-Finger-Dependent Ubiquitin-Protein Ligase Not4p in Saccharomyces Cerevisiae
May 01, 2007; ABSTRACT The Ccr4-Not complex consists of nine subunits and acts as a regulator of mRNA biogenesis in Saccharomyces cerevisiae....
RAWUL: A new ubiquitin-like domain in PRC1 Ring finger proteins that unveils putative plant and worm PRC1 orthologs.(Research article)(protein regulator of cytokinesis 1)
Jun 27, 2008; Authors: Luis Sanchez-Pulido ; Damien Devos ; Zinmay R Sung ; Myriam Calonje (corresponding author)  Background...
Fertilization in C. elegans requires an intact C-terminal RING finger in sperm protein SPE-42.(Research article)(Report)
Feb 23, 2011; Authors: Luke D Wilson ; Jacqueline M Sackett ; Bryce D Mieczkowski ; Abigail L Richie ; Kara Thoemke ; Jon N...