WCertification mark
WAppellation d'origine protégée (Switzerland)
WAsthma and Allergy Friendly
WBIS hallmark
WBritish Approvals Service for Cables
WBritish Standards
WBSI Group
WCE marking
WCEBEC
WCentral Board of Film Certification
WChina Compulsory Certificate
WDQS
WDualDisc
WENEC Mark
WEnergyGuide
WEnhanced CD
WEurasian Conformity mark
WEuropean Vegetarian Union
WFair Trade USA
WFairtrade certification
WFCC mark
WFM Global
WGeprüfte Sicherheit
WGood Housekeeping
WGulf Conformity mark
WGuobiao standards
WInternational Fairtrade Certification Mark
WJapanese Industrial Standards
WKeymark
WKorean Standards Association
WNordic swan
WNorma Oficial Mexicana
WNSF International
WOrganic certification
WQS mark
WRadura
WUL (safety organization)
WRecycling symbol
WStar of Life
WState quality mark of the USSR
WTrusted Shops
WUKCA marking
WUL (safety organization)
WUnion label
WVegan Awareness Foundation
WWarrant of Fitness
WWater Regulations Advisory Scheme
WWater Resistant mark
WWoolmark