I にふさわしい単語がいろいろとあるが、Instrument を充てると仕事上では非常に使いやすい。
instrument |ˈinstrəmənt|
noun
1 a tool or implement, esp. one for delicate or scientific work : a surgical instrument | writing instruments. See note at tool .
• a thing used in pursuing an aim or policy; a means : drama as an instrument of learning.
• a person who is exploited or made use of : he was a mere instrument acting under coercion.
2 a measuring device used to gauge the level, position, speed, etc., of something, esp. a motor vehicle or aircraft.
3 (also musical instrument) an object or device for producing musical sounds : a percussion instrument.
4 a formal document, esp. a legal one : execution involves signature and unconditional delivery of the instrument.
日本語では「道具」だが、英語では使い分けがあり、
THE RIGHT WORD
A wrench is a tool, meaning that it is a device held in and manipulated by the hand and used by a mechanic, plumber, carpenter, or other laborer to work, shape, move, or transform material (: he couldn't fix the drawer without the right tools). An implement is a broader term referring to any tool or mechanical device used for a particular purpose ( | agricultural implements). A washing machine is an appliance, which refers to a mechanical or power-driven device, especially for household use ( | the newly-married couple went shopping for appliances). A utensil is a hand-held implement for domestic use ( | eating utensils), while an instrument is used for scientific or artistic purposes ( | musical instrument; surgical instrument). Apparatus refers to a collection of distinct instruments, tools, or other devices that are used in connection or combination with one another for a certain purpose ( | the gym was open, but the exercise apparatus had not been set up).
楽器も Instrument であることも手伝って、今後は Idea,Information、Instrument の３つを使っていこうと思う。