In the media, in policy-making, but also in research articles, intelligent systems are referred to as algorithms, artificial intelligence, and computer programs, amongst other terms. We hypothesize that such terminological differences can affect people's perceptions of properties of intelligent systems, people's evaluations of systems in application contexts, and the robustness of research as findings may be influenced by terminological differences. In two studies (N = 397, N = 622), we show that terminology does indeed affect laypeople's perceptions of system properties (e.g., perceived complexity) and evaluations of systems (e.g., trust). Our findings highlight the need to be mindful when choosing terms to describe intelligent systems, because terminology can have unintended consequences, and may impact the robustness and replicability of HCI research. Additionally, our findings indicate that terminology can be used strategically (e.g., in communication about intelligent systems) to influence people's perceptions and evaluations of these systems.CCS Concepts: • Human-centered computing → Empirical studies in HCI; User studies;