What are prayer beads?

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Afrikaans عربى Bosanski Български 简体中文 繁體中文 Deutsch Español پارسی Français Ελληνικά हिन्दी Hrvatski Indonesia Italiano 日本語 Kiswahili 한국어 Nederlands Polski Português Română Русский සිංහල Slovenčina Tagalog தமிழ் ภาษาไทย Türkçe українська اُردُو Việt