The user query appears to be a set of Italian words: "uffici usi cosa sono" which translates to asking what "uffici" and "usi" are, likely in a general or linguistic sense. Here’s a concise clarification and answer based on standard Italian meanings: Direct answer

• Uffici: plural of ufficio, meaning offices or workplaces, as in rooms or spaces where official work is performed, or the organizational units within an institution.
• Usi: plural of uso, meaning uses, customs, practices, or usages. In different contexts it can refer to customary rules, general practices in a field, or normative conduct (e.g., “usi e costumi” usages and customs).

Contextual nuances

• Uffici appears in many compound terms, such as "ufficio postale" (post office) or "ufficio tecnico" (technical office). It denotes a physically or functionally defined department or place within an organization.
• Usi can be used in legal or contractual language as “usi” to denote customary practices within a jurisdiction or industry. It also appears in everyday speech to talk about typical ways of doing something.

If you meant something else (for example, a specific organization named USI, or a legal/technical term in a particular country), please specify the context (country, field, or sentence you’re dealing with) and I can tailor the explanation.