• Random Access Channel
  Random Access Channel
  Random Access Channel is used in mobile phones or other wireless device on a TDMA-based network when it needs to get the attention of a base station in order to initially synchronize its transmission with the base station....
  
   (RACH), a feature of mobiles or other wireless devices
• Sergei Rachmaninoff
  Sergei Rachmaninoff
  Sergei Vasilievich Rachmaninoff was a Russian composer, pianist, and conductor. Rachmaninoff is widely considered one of the finest pianists of his day and, as a composer, one of the last great representatives of Romanticism in Russian classical music...
  
  , the composer. "Rach" ( or /ˈrɑːk/) is a colloquial short form of his surname, most commonly used to refer to some of his compositions, such as "Rach 2" (Piano Concerto No. 2) "Rach 3" (No. 3)
• Rachel (given name)
  Rachel (given name)
  Rachel is a feminine given name. The name ranks in the top hundred most popular names for girls in the United States, Canada, England and Wales, Scotland, Northern Ireland, Ireland, and Australia as well as in Israel...
  
  . "Rach" ˈreɪtʃ is the colloquial short form of this given name
• Royal Aberdeen Children's Hospital
  Royal Aberdeen Children's Hospital
  The Royal Aberdeen Children's Hospital or RACH is a children's hospital in Aberdeen, Scotland. It is situated on the Foresterhill site, with the Aberdeen Royal Infirmary and Aberdeen Maternity Hospital...
  
   or RACH, a paediatric hospital, in Aberdeen, Scotland

Other

• Johannes Rach
  Johannes Rach
  Johannes Rach was a Danish painter and draughtsman whose works from Copenhagen and Indonesia are a valuable source of architectural and cultural historic knowledge. He began his artistic career painting topographical views for the royal court in Copenhagen...
  
   (1720-1783), Danish painter who sketched Batavia (now Jakarta, Indonesia) in 17th century
• Rach, the traditional name for Saint Dismas
  Saint Dismas
  The Penitent thief, also known as the Thief on the Cross or the Good Thief, is an unnamed character mentioned in the Gospel of Luke who was crucified alongside Jesus and asked Jesus to remember him in his kingdom....
  
   in the Eastern Orthodox Church
  Eastern Orthodox Church
  The Orthodox Church, officially called the Orthodox Catholic Church and commonly referred to as the Eastern Orthodox Church, is the second largest Christian denomination in the world, with an estimated 300 million adherents mainly in the countries of Belarus, Bulgaria, Cyprus, Georgia, Greece,...
  
  es