monero-site/_i18n/en/resources/moneropedia/ring-size.md

terms	summary
ring-size	total number of possible signers in a ring signature

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The Basics

Ring size refers to the total number of signers in a @ring-signature. Before release [0.13.0 "Beryllium Bullet"]({{ site.baseurl }}/2018/10/11/monero-0.13.0-released.html), it was possible to select an arbitrary number of signers. With release 0.13, it was decided to set this number to 11 to enforce transaction uniformity.

Ring size (11) = foreign outputs (10) + your output (1)

Foreign outputs are typically called "decoys," and the number of decoys was previously called the "mixin" size.