//

Two slashes (//) are:

Computing

• The prefix for a line comment in C-family computer languages
• The root directory in the Domain/OS Shell — see Path (computing) § Summary of systems
• The operator for integer division, in Python 2.2+ and other programming languages
• An empty regular expression, in ed-style syntax
• The logical defined-or (null coalescing) operator in Perl
• The prefix for the authority component of a Uniform Resource Identifier (URI) — always preceded by a colon, as in scheme://authority…
• The abbreviated syntax for the "descendant-or-self" axis specifier in XPath

Mathematics

• Historically used to express ratio by Nicolo Tartaglia

Other uses

• 𝄓, a caesura in musical notation
• ⫽, the prefix and suffix for a diaphoneme in linguistic transcription
• ⫽, Unicode character U+2AFD DOUBLE SOLIDUS OPERATOR, in Supplemental Mathematical Operators
• ◌⃫, Unicode character U+20EB COMBINING LONG DOUBLE SOLIDUS OVERLAY, in Combining Diacritical Marks for Symbols

See also

• / (disambiguation)
  • Slash (punctuation)
• Vertical bar (disambiguation), for "‖" stylized in pseudo-italics
• \\ (disambiguation)
• /\ (disambiguation)
• \/ (disambiguation)
• /r/ (disambiguation)
• (///), the logo of TV Rain, an independent Russian-language television channel
• All pages with titles beginning with //
  • :///CODENAME: dustsucker, 2004 album by Bark Psychosis
  • (///M), the logo of BMW M GmbH, a manufacturer of high-performance luxury cars
  • /// Cheers!, a publication by the Apple Pugetsound Program Library Exchange (A.P.P.L.E.)
  • "//aguardiente y limón %ᵕ‿‿ᵕ%", a song by Kali Uchis on Sin Miedo (del Amor y Otros Demonios), 2020
  • //build/, an annual conference event held by Microsoft
  • //Khara Hais Local Municipality (merged 2016), in the Northern Cape province of South Africa
  • ://Neuromance, 2005 album by Dope Stars Inc.
• EUPHORIC /// HEARTBREAK \\\, 2011 album by Glasvegas
• Dreaming Is Sinking /// Waking Is Rising, 2017 album by Dayseeker
• IN///PARALLEL, 2017 album by Dhani Harrison
• Apple ///, a personal computer model
• ht://Dig, an indexing and searching system
• The Unexplored Summon://Blood-Sign (Japanese: 未踏召喚://ブラッドサイン), 2014–2019 Japanese light novel series written by Kazuma Kamachi and illustrated by Waki Ikawa
• .hack//Sign, 2002 Japanese anime television series
  • .hack, the franchise based on it, consisting of various works starting with ".hack//"
• Pärnu maantee 36 // Roosikrantsi 23, a mixed-use building in Estonia
• Lello//Arnell, a collaborative duo of artists Jørgen Craig Lello and Tobias Arnell
• Blitz//Berlin, a trio of Canadian composers based in California
• Yamantaka // Sonic Titan, a Canadian experimental music and performance art collective
• Girl Walk // All Day, 2011 dance music video directed by Jacob Krupnick
• "Finally // Beautiful Stranger", 2019 single by Halsey, from Manic
• "Blood // Water", 2017 single by Grandson, from A Modern Tragedy Vol. 1
• Pompeii // Utility, 2026 album by Earl Sweatshirt, Mike, and Surf Gang
• Primeval: Obsession // Detachment, 2025 album by Tallah
• Past // Present // Future, 2023 album by Meet Me at the Altar
• Prey//IV, 2022 album by Alice Glass
• Lost Forever // Lost Together, 2014 album by Architects
• Flourish // Perish, 2013 album by Braids
• Invisible Empire // Crescent Moon, 2013 album by KT Tunstall
• Warrior // Worrier, 2012 album by Outlandish
• YT//ST, 2011 album by Yamantaka // Sonic Titan
• Health//Disco, 2008 album by Health
• Amplified // A Decade of Reinventing the Cello, 2006 album by Apocalyptica
• My Passion // Your Pain, 2003 album by Callenish Circle
• strange haircuts // cardboard guitars // and computer samples, 2001 album by Information Society