Wikipedia:Number sign

On Wikipedia, a number sign, hash sign, pound sign or hashtag (#) may refer to one of the following uses:

• Number signs used in wiki markup
  • Number signs used to create ordered lists
  • Number signs used to link to a section of a page
• Due to technical restrictions, number signs are not allowed in page titles.
• Number signs' use in article writing (Manual of Style)
• Number signs used as tags in edit summaries can be searched using toolforge:hashtags